Electrical annunciator



(No Model.)

- M. M. WOOD.

ELECTRICAL ANNUNGIATOR.

No. 385,894. Patented July 10, 1888.

Wfnesses.

N. P TERS, Phulo-Lwwgnphahzwashihgtm me, I}

UNITED STATES llIONTR-AVILLE M. \VOOD, OF ERIE, PENNSYLVANIA.

ELECTRICAL ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 385,894, dated July 10.1888.

Seiial No. 265,825). (No model.)

To Cl/ZZ whom, it may concern.-

Be it known that I, MONTRAVILLE ilI. \VOOD, a citizen of the UnitedStates, residing at Erie, in the county of Erie and State ofPennsylvania, have invented certain new and useful Improvements inElectrical Annunciators; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, forming part of this specification.

My invention consists in the improvements in electrical annunciatorshereinafter set forth and explained, and illustrated in the acpanyingdrawings, in which Figure 1 is a perspective view of the mechanism ofmyimproved annunciator with parts broken away. Fig. 2 is a verticalcentral section of same. Fig. 3 is a rear view in elevation of a singleannunciator. Fig. 4 is a like view of the same arranged in a series.Fig. 5 is a front view in elevation showing the movement of the hand orpointer. Fig. 6 is a like view of the same, showing the pointer havingfigures thereon operating behind an opaque face having an openingtherein at which the hand presents the figure.

Like letters refer to like parts in all the figures.

In the construction of my improved electrical annuneiator shown, A is anelectromagnet of ordinary construction, having a core, B, and positiveand negative poles O and D, the core B being wound with coils E of fineinsulated wire, in the usual manner. Through the center of the core B, Imake a small transverse hole, F, in which I preferably insert a sectionof small tube, G, of copper or other non-magnetic metal, which serves asa bearing for the axis ofan oscillating armature, II. This armature H ismade of soft iron and is preferably mounted on a wire, I, securedcentrally thereto, of brass or other non-magnetic metal,which rotatesfreely in the tube or bearing G,and carries on its opposite end a handor pointer, J. A small adjustable arm, at, having thereon a smallweight, b, is also secured to the outer face of the armature H, as andfor the purpose set forth. A stop, f, is also preferably secured to oneof the poles of the magnet A, which serves to limit the movement of thearmature H.

The face Lis made in the usual manner, and the magnet A, with themechanism hereinbefore described, is secured to the back side of theface L, the tube or hearing G projecting through a small opening in theface L, through which the wire I projects sufficiently to receive thehand or pointer J, which is then secured thereto, the parts being soadjusted that the armature II will oscillate in close proximity to thefaces 0 and (Z of the poles O and D of the magnet A, butwill not contacttherewith. The weight!) on the armature H is also adjusted to one sideof the center of the upper end of the armature, so that when thearmature H is in a position parallel Willi the poles of the mag net A,as shown by the dotted lines h h in Figs. 3 and I, its center of gravityis at one side of the center of the armature H, so that on its beingreleased the upper end, k, thereof will fall over to one side until itcomes into contact with the stop f, as shown by the dotted lines Z l inFigs. 3 and 4, moving the hand J, attached to its axis I, a likedistance over the face of the plate L.

The hand J, I make of any convenient shape, either, as shown in Fig. 5,adapted to point to a figure on the outside of the face L or with adisk, 6, having the figure thereon, so that the movement of the hand Jshows the figure through an opening in an opaque face, L, behind whichthe hand J moves.

In operation the armature H normally rests in the position shown inFigs. 1, 3, and 4,With the hand or pointer J in the position shown inFigs. 1, 5, and 6. hen in this position, the upper end of the armatureI-I, balanced as hereinbefore described, rests against the upper part ofthe stop f, and in that position it is so nearly balanced that anelectric current sent through the coils E of the magnet A will move thearmature on its axis I until it as snmes a position parallel with thecore B of.

remain until restored to the position shown in Fig. l.

I have not shown any device for raising the armature H from the positionshown by dotted lines Zlin Figs. 3 and 4 to its normal position againstthe stop f, that being no part of my invention,as any of the well-knowndevices now used in electrical annunciators for that purpose can beapplied to and used with the mechanism hereinbefore described.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is

1. The combination, in an electrical annunciator, ofa magnet consistingofa soft-iron core having coils wound thereon,with an armature pivotedon its center, so that both of its arms will oscillate in closeproximity to the poles of said magnet, substantially as and for thepurpose set forth.

2. The combination, in an electrical annunciator, of a magnet consistingof a soft-iron core and coils of wire, with a centrally-pivoted armatureoscillating on an axis at right angles to and passing through an openingin the magnet-core between the coils in a plane parallel to and in closeproximity to the poles of the magnet, stops for limiting the movement ofthe armature, and an indicator seou red to the axis of the armature,substantially as and for the purpose set forth.

I 3. The combination, in an electrical annunciator, of a magnet, A,consisting of a soft-iron core, B, poles C and D, at right anglesthereto and to the coils E, wound on the core B, with an oscillatingarmature, H, mounted on an axis, I, passing through said core B at rightangles therewith, and a hand or pointer, J, se-

cured to said axis, substantially as and for the purpose set forth.

4. The combination,in an electrical annunciator, of a magnet consistingof a straight-bar core, B, poles O D, and coils of wire E E, woundaround the bar B, with an armature, H, having an adjustable weight, b,thereon, and centrally mounted on a wire, I, rotating in the tube G,passing through the core B between the coils E E and at right anglestherewith, a hand or pointer, J, secured to said wire I, and a stop, f,substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

MONTRAVILLE M. WOOD.

\Vitnesses:

HENRY A. CLARK, WM. E. WILsoN.

